What is that on top of the mill's head? Drawbar or a place tomount encoder?
Yes, the spindle is a splined, two part thing and the hollow top of
the spindle stays in place, regardless of the Z axis position (bottom
part).
This means that mounting an encoder on the top is very easy, just a
little machining exercise to make something that I can stick inside
and make it stay connected to the spindle, with some little top piece
to mount encoder wheel.
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